Is Red Spot Algae Dangerous?

Red algae are one of the oldest species of algae on our planet. They are typically multicellular organisms scientifically identified as ‘Rhodophyta.’

Most of these algae types are primarily found in marine and brackish water tanks, but they can also thrive in freshwater environments under certain conditions.

Audouinella (Black Brush Algae/BBA) and Compsopogon coeruleus (Staghorn Algae) are genera of Rhodophyta. These two algae are often present in planted tank setups and can be a bane to many hobbyists.

However, some aquarists let the BBA develop on rocks or wood to create a realistic view in their tank.

This article will discuss another freshwater red algae species that rarely seems to thrive in an aquascape tank, red spot algae (Hildenbrandia).

Is Red Spot Algae Dangerous?

Generally, most aquarists consider algae to be ‘weeds,’ and many discuss it as the main topic on the web forum because algae bring more disadvantages than benefits when they appear in the tank.

Simply, weeds are plants that most people do not want to grow. The algae family from the Rhodophyta division is particularly difficult to control, which can be frustrating for hobbyists.

Information about red spot algae is probably seldom shared by other aquarists in online forums or discussed in web topics, as these algae have a lower chance of developing in the tank. So only a few tank keepers were facing them.

According to scientific studies on researchgate, there are six freshwater Hildenbrandia usually found in nature, including H. rivularis, H. angolensis, H. arracana, H. ramanaginaii, H. jigongshanaensis, and H. Japanese.

One or more species of them are suspected of causing the red-spot algae to emerge in the planted aquarium.

In their natural habitat, they primarily inhabit streams with running or calm water. These algae commonly live in rivers, lakes, or ponds.

Tropical Hildenbrandia species can tolerate extreme temperatures, ultraviolet light, and desiccation. It’s making them become a difficult enemy to fight in the aquarium.

When invading the aquarium, the red spot algae usually sticks tenaciously, coating the leaves or decorations to create a red layer on top of them. They can also cling to the tank glass, forming a reddish-brown circle.

They are growing relatively slowly, allowing you sufficient time to find an effective way to eliminate them.

Like other red algae (Coralline algae) often seen in saltwater tanks, you must make a great effort to fight against them.

If a small population of red spot algae invades your tank, do not panic. Having a small amount of any type of algae is normal. With a rule, you can still manage their growth.

However, if they begin to run out of control, you should discuss it soon with the experts to find the proper method to counter them.

Is The Red Spot Algae Dangerous For Fish?

Like most algae that often attack in planted tanks, they are actually not too dangerous to the fish and other creatures. For a couple of fish and shrimp species, they may become an extra snack in leisure.

However, you surely never want it if your tank turns a poor shade of red in appearance. Letting the algae absorb all the nutrients in the water, and your plants will die.

After that, the oxygen-producing process will decrease significantly, making your fish suffer and giving unsightly view due to reddish their effect in the tank.

Common Causes Of Red Spot Algae

You might be curious about what kind of problem stimulates them to spread in the aquarium.

And you are lucky; come to the right place where everything related to red spot algae will be discussed in this article.

Learning about these rare and unique freshwater algae will help protect your tank from their invasion. It is also helpful to identify what kind of method you should use if they infect your tank.

Based on several sources of information, below are some reason that causes these algae to live in your planted aquarium:

They are Brought Into The Aquarium When You introduce new Fish Or Plants From a Contaminated Tank

This is the most likely reason for inviting the red spot algae to grow by introducing new plants or water from the fish bag that was contaminated with them. This also applies to other tiny pest creatures such as ramshorn snails and detritus worms.

Some unseen, tiny filaments probably cling to newly added aquatic plants or float in the water and develop into new spores in the new aquarium.

These algae could establish once they are deposited into a compatible tank environment.

Unstable Nutrients

Unstable macronutrients are the main element that causes almost all types of algae to appear.

Higher iron and nitrate levels in the water are often associated with the appearance of red spot algae. Some aquarists believe that the object that can promote it to rise is utilizing soil under the substrate. Besides that, other types like GDA and GSA also appear along with hildenbrandia.

Too Much Lighting Duration And Spectrum

Higher nutrients, combined with excessive lighting duration and spectrum, can occur when your tank has insufficient aquatic plants to absorb them, allowing red spot algae to thrive.

These factors also apply to other types of freshwater aquarium algae.

Deficiencies Of CO2 And High Temperature

In their natural habitat, red spot algae are typically found in a specific stream with clean water, consistent nutrients, low CO2 levels, and extreme temperature fluctuations.

When your tank condition meets these requirements, those factors may encourage algae growth. A lack of CO2 can also lead to the growth of other types of red algae, such as staghorn. However, green hair algae also prefers this environment to multiply its numbers in the aquarium.

How To Control Red Spot Algae

You can apply several methods below to control and avoid red spot algae blooming in your tank. Let’s see the list:

Quarantine Any New Species

New aquatic plants, fish, shrimp, and snails must pass the quarantine phase. It aims to kill any parasites, fungi, and bacteria that stick to them.

When placing the fish in a separate tank, aquarium salts were added, and the tank was aerated for 1-2 days, depending on the species types and conditions.

Remember to always drain water from fish bags. Ensure that you clean any tank equipment used from other tanks before applying it to the new tank, using a bacteria remover.

Perform a disinfection bath for new aquarium plants before introducing them to the tank, using a mixture of bleaching liquid for 2-3 minutes. A typical dosage usually used by most aquarists is 1part of bleach mixed with 19 parts of water.

This mixture can also be used to bathe decorations, such as stones, wood, caves, and aquarium equipment.

Control The Red Spot Algae With Algae Eaters

We believe that the presence of any algae eater is crucial for maintaining a healthy aquascape tank.

They can reduce or remove algae, ensuring your aquarium always performs well. Some also have nice appearances that never bore you when you watch them.

Keep this in mind: not every algae-eating species you find in the trades accepts all algae types. Every species has its own tendencies.

Crossocheilus siamensis, popularly called ‘Siamese algae eaters‘, garra rufa, nerite snails, and Amano Shrimp is suggested to have a stunning performance in fighting the red spot algae.

Various shrimp species may prevent new young growth; when the algae are established, they tend to be less effective.

We recommend using SAE due to its high effectiveness, as it effectively eradicates black beard algae.

Keep Your Tank Always In Good Standing

Regular maintenance is crucial for maintaining your tank’s health at all times. Checking all types of equipment regularly, avoiding overfeeding your fish, performing regular water changes, monitoring nutrient levels, and constantly siphoning aquarium waste are essential activities for maintaining a healthy tank.

That may seize your time and energy, but the results never lie. If you truly love your hobby, any complex problem can be faced with a sense of happiness.

How To Get Rid Of Red Spot Algae From Your Aquarium

There is a technique to remove the red spot algae inside the tank. It can be applied depending on the level of algae growth.

Before attempting to wipe it, observe your tank conditions first. Then, you will know which method is most suitable for killing them. Let’s learn all of the techniques below:

Scrubbing The Red Spot Algae Manually

Eliminating them using algae scraper is the easiest and first step you should perform. For small weed populations, it is pretty effective in reducing their growth level.

It’s probably not clean of all spores; they will return and invade your tank again. So you should combine this first step with the next steps. At least, the algae have disappeared for the time being.

Put More Algae Cleaner Crew

Adding more algae cleaners is the next simple step after manually scrubbing algae. As stated above, SAE fish are most effective in controlling and preventing algae from spreading again.

You can put 2-4 fish, or as many as you want, to guard your tank. Ensure you also provide more space in your tank for other populations. Do not make the SAE stressed or get bullied by different species.

So, it’s essential to better understand your tank population before adding new algae-eating crew.

Ensure The Nutrients Always Stay Balanced

The imbalance of macronutrient elements is the primary point that causes the red spot algae invasion. From this sentence, you will understand what kind of job you should do.

Use the nutrients checker to find the imbalanced substance. After that, purchase the necessary fertilizers. Drop a few doses and continue to monitor the progress.

Returning all compounds to the former conditions heals your tank quickly. Below is the formula that can be used as the reference:

• Phosphate: 0.1-1 mg/l
• Nitrate: 10-25 mg/l
• Magnesium : >10 mh/l
• Potassium: 5-10 mg/l

Enhance The CO2 Dissolved

Increasing Carbon dioxide levels help stop the survival of spotted red algae in the planted tank. Raise it slowly from one day to another until it achieves the maximum rate.

This is to prevent your fish from being stressed due to oxygen deficiencies in the water. In our experience, a sudden rise in CO2 content causes our fish to struggle to breathe due to the excessive amount of dissolved carbon dioxide.

Utilizing a CO2 checker is vital to understanding how to control this substance more effectively and accurately. The standard formula most aquarists use is 20 to 30 mg per liter of water.

Do A Water Change

Frequent water changes, trimming overgrown plants, and removing all dirt are effective methods to combat algae.

Removing the infected leaves using aquarium scissors is another good idea. Cutting the older leaves is also suggested to reduce the chance of spreading the more significant algae.

Use the aquarium siphon tool to pick up organic waste and feces from the substrate. Those became essential points that supported the development of algae.

If the red spot algae growth appears more severe, you can perform an extreme water change to treat it by reducing the water level in your tank by almost 75%. After that, boost it with aquarium fertilizers and CO2 injection.

Treat The Red Spot Algae With Liquid Carbon

Utilizing liquid carbon almost works for almost all types of freshwater algae. Injecting 3-5 ml doses routinely can hold the algae growth level.

Perform this for a few days until the algae are gone. This liquid commonly sells at affordable prices in local or online shops. As long as you administer sufficient doses, this liquid is not harmful to other tank creatures, such as fish or shrimp.

Reducing Light Intensity And Water Temperature

Lighting duration, spectrum intensity, and temperature level are also suggested as contributing factors to the development of red spot algae.

Decreasing the period and spectrum of lighting is a simple way to do so. Setting up an smart aquarium lamp becomes more accessible.

You can lower the temperature by using a chiller or adding ice wrapped in plastic bags or containers to the aquarium, and installing a thermometer system to quickly monitor the temperature.

Some aquarists do an extreme blackout for 1-3 days to fight with them, but the results are not too effective.

Check Your Water Circulation

Some algae thrive well in dead spot areas inside the aquarium, which are caused by lousy water circulation, including this hildenbrandia.

This means that the fresh water cycled from the filter should reach every space inside the aquarium, spreading the macronutrients to every plant.

A large aquarium is prone to having some dead spots if using a weaker filter system; choose suitable equipment, or you can add a small powerhead to increase the flow levels.

Use Distilled Water

Tap water generally contains heavy iron (Fe) and other metal substances, which is a point that frequently drives the red spot algae to develop.

This water type should be avoided; instead, use distilled water, as its contents are suitable for replacing the wasted water during a water change.

To save more money, consider purchasing a simple RO water kit specifically designed for aquariums, rather than buying new bottled distilled water at the store.

Use Chemical Controls

We do not advise using this method, but if you feel compelled to surrender, using algaecides might become the treatment of last resort.

Algae control products are known to be effective in killing red spot algae in aquariums. Still, on the other hand, they also harm some aquatic plants (especially soft-leaved plants), so you should use the medicine cautiously.

This treatment has little effect on some hardy plants, such as Cryptocoryne, Anubias species, Microsorum, Echinodorus, and others.

Algaecides also remove other algae species at once. Significant water change before adding the medicines will improve the remedy’s effectiveness.